How to distinguish between "national standard" and "non-standard" of wire and cable?

Update:08-09-2018

Summary:

It is recommended that you look at it, two tests, three […]

It is recommended that you look at it, two tests, three weighs, four price, five copper, six quality tests, and six strokes.

A look: look at the wire and cable products with or without quality system certification, see if the certificate is standardized, see if there is a factory name, site, inspection chapter, production date, and see if the trademark is printed on the wire, specifications, voltage and so on. Also look at the cross section of the copper core of the wire, the superior color of the copper color is bright, the color is soft, otherwise it is a defective product.

Second test: It is advisable to take a wire head repeatedly and bend it by hand. Any soft touch, good fatigue resistance, strong plastic or rubber feel and no crack on the wire insulation are excellent products.

Three weighing weight: good quality wire and cable, generally within the specified weight range per 100m weight. Such as the commonly used plastic insulated single-strand copper core wire with a cross-sectional area of 1.5mm2, 1.8-1.9kg per 100m weight; 2.5mm2 plastic insulated single-strand copper core wire, 3-3.1kg per 100m weight; 4.0mm2 plastic The insulated single-strand copper core wire has a weight of 4.4-4.6 kg per 100 m. Poor quality wires have insufficient weight, either insufficient length or excessive copper core impurities. If it is a cable, especially a large-size cable, the method of weighing the soil is the easiest way to best indicate whether the cable contains copper and the cross-section of the conductor. Generally, there is a cable that steals copper and makes a small cross-section. The amount of copper contained in the weight range that cannot be up to the national allowable error can be basically regarded as non-standard.

Four-price ratio: Due to the low production cost of counterfeit and shoddy wires, when vendors sell, they often sell at low prices with low prices and good quality, which makes them fooled. Therefore, when buying, be careful, don't stun the mind for the "good quality and low price" advertised by the merchants, and eventually be deceived. Five look at copper. The copper core of the qualified copper core wire should be purple, shiny and soft to the touch.

Five look at copper material: The copper core of the inferior copper core wire is purple black, yellowish or white, with many impurities, poor mechanical strength, poor toughness, a little force will break, and there are often broken wires in the wire. When inspecting, you only need to peel off the wire for a while, then use a piece of white paper to rub it slightly on the copper core. If there is black material on the white paper, it means that there are more impurities in the copper core, which can be regarded as "non-standard." "Wire and Cable.

Six quality inspection: In the case of differences in cable quality, it can be sent to a third-party testing agency for testing. Based on the eligibility of the authoritative test report.